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@geiten tetes hstwt @Hirn vLetters Patent No. 76,384, dated April 7,1868.

IMPROVEMENT IN SAW-MILLS.

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TO ALL WHOM IT. MAY CONCERNz' Be it known that I, -DAvID B. BARTHOLOMEW,of Lancaster, in thc county of Lancaster, and State of Penn-` lsylvania,'have invented certain new and useful Improvements on-Re-snwing-Mnchines; and I do hereby declare that'thefollowng is aVfull, clear, and4 exoctdesci'iption of the construction and operationofthe same, reference bein-g had to the accompanying drawings, making apart of this specification, inwhich- Figure 1 isa perspective viewl ofthe entire machine, with my improvementsiu place, with a board, 'in theact of being slit, introduced.l l l Figure 2 is a rear elevation. V

Figure, a side elevation.

Figure 4, a perspective view ofthe combination of the feed-rollers, Nos.1 and 2.

Figure 5, the uted rollers I Il and their gearing for adjusting andoperating them.

Figure 6, a side view of the four grooved pulleys and centraladjusting-pulley; also the upper and lower vbearings of the worm-shaftand pinions, by which the lluted pulleysere revolved, with otherdetached illustra- Ations designated by letters ofreference. I

4 The nature of my invention consists in the gearing, arrangement, undadjnstability of the feed-rollers, so that boards, Snc., can be slit ofequal4 thickness, or of unequal thickness or bevel; also in the mannerof 'separating, holding, and gnidingthe Aslit materials, as they are fedforward and slitby-the saw, in a vertical position, and to preventcrowding onthe sewnA i l vTo enable others skilled in the art tolnakeand use my invention, I will now proceed 'todoscribe thecon'-4 structionand operation of the sanne.

The timbers ofthe framework, marhed from A1 to A7, and supports or legsT, withtherear elevated framework, consisting of four posts x andfninecross-pieces y, for the several 'bearings'as also the driving and loosepulleys B B on themain shaft, with its boxes b, or bearings for acircular saw, C, of enyapproved make, present no special novelty, andrequire no specil description. Fig. I clearly illustrates-theseseveralparts, l which may be drivenbyr power m'ost desirable. i 1 1 Thearrangement of my vertical {eed-.rollers is shown by gs;.4 and 5. Aluted-roller, I, and plain roller H are combined, and have theirbearings in aV topiand'bottom cross-piece I H, which' are boxed out, sothat their projecting ends aboveoome under therupper'crossepieces y, andtheir lower ends on top of the under crosspieces y, seen in the-rear and`front of the elevated framework, on the hind end of the machine, and onand against which seidA cross-pieces y, theltwo pairs of rollers No.1und No. 2, with their bearings I II, slide in their adjustment. Thesetwo pairs' of rollers are independent of each other, and Aere'madeadjustable laterally for the reception .of the board or materiel to bevslit by the saw, as in my former patent-of 1857, only that each pairhas a'smooth'roller, H, in front,land a tluted or corrugated4 feed andtraction-roller', I, behind. These latter, I I", are revolved inwardly,by means of a4 pinion-R R, on a prolonged spindle, the one above and theother below their several bearings, at which points they mesh into uworm-gear, S S', on a shaft horizontally held in brackets or sidebearings e s. The ,worm-shafts have each a grooved pulley, K, with anendless chain, or its equivalent, from the upper, K, to the lower, K.The upper screw or worm-shaft'is prolonged to one side, and is providedwith a conic pulley, L, which derives motion fr om a pulley on the mainshaft, that` carries the saw C,

by means of a. strap-connection, as shown.

l The external pair of rollers, with their bearings4 No. I, are made-adjustable laterally, at four points, by. means of screws connectedwith the same, which screws are provided each with a grooved pulley, elto z, as

shown', andV combined in lthe unity of their action'by an endless chaingc h, orv'its equivalent, by means of a crank-handle aliiredi'to one ofthem. In order,` to give more or less tensionto the endless chain ch, anintermediate cdjustahle pulley, e, is applied centrallybetwecn the lowerpair.` By slackening the chain, the upper pair can be revolved -hy handin one direction, andfthe lower pair in the opposite direction, so astothrow the feed-rollers into a sloped position to `present..the material4between the pair obliqlvlelyto the action of the saw, which -wll slitthe same diagonally or in a bevel manner, soy-Often required for'various purposes, The other 'pair of rollers, No.2, will readily adjustthemselves to the slope, and are prevented from fallingtover bymeen'sjofa hinged, hooked. holder, xg connecting the top bearings -I H of therollers Nos'. l and 2. The latter pair are tfurther combined in theirbearings by a vertical piece, lili. This hasn slot for adjusting araek',V,-conniected therewith. Said rack meshes inten pinion, W, whichpinionis held on the spin dlcf the'large grooved pulley Q, to which acord andweight, g, are attached, to adjust and give 4pressure` againstthe inner pair, or No. 2 rollers. When a narrow board is introducedbetween thefeed-rollers, there is a' tendency that the free painofrollers, No. 2, incline inwards above, and, in order to keep themparallel, thereis a handled screw, U, provided A to prevent the same byprop-er adjustment. The lower bearing;-

of'No. 1 has also blunted pins VIm resting against the lower bearing ofNo. 2,- so that both pairs of rollers can be adjusted laterally, inorder to present the material held between them impositionWith'respectto the saw, so that the desired thickness vcan bc slit off.

If desirable to'operate the upper and lower paiscf pulleysindependently, the grooves may be doubled, and each pair have anadditional chain, in order to movethem in unison, and not separately, iffound more convenient; but I dispense with the extra'cha'inmand use thecentral pulleys5 to slacken ofr tighten the chain at pleasure. I alsoprovide a slotted har, E, centrally over the suiv-blade, and throughwhich slot the saw partially enters. This bar E is hinged to the topcross-piece y of the elevated framework aforesaid, and inclines over thesaw.v There is-also a curved guard-plate, D, to prevent the operatorfrom coming in contact with the teeth ofthe saw. This hinged bar E canbe folded back out of the'way, and is provided in front with a roller,l), having a central wedge-shaped ange, p, to enter the scarf of theparted board, while on the lowerside are two projecting pins pp, one oneach side, to prevent the split board from falling outward while it -israised upward on its hinge, as the slit portions are fed forward to thewedgesbaped separatorlNon theouter cross- Vpiece A!` of the main frame.-This separator' N has two vertical rollers n n, and also two horizontalhanged rollers o o, one on each side, upon which the slit pieces slideeasily-forward in avertical position by the combined urrnngementsetforth, and prevents all strain upon the saw. For a further protection tothesaw-blade, to prevent choking or strain, I ,also provide a dcfiectoro o on each side, made adjustable by set-screws in slots in `the base ofthe same, bent ont at rightangles, and resting'upon the guidefftimbersthat are in close proximity on each side ofthe saw, marked A6. Thetriangular vertical portion of the tieilectoris in close contact-withthe saw at the rear end, and deiiects the slit boards more or lessoutward. l

-Having nowdescribed the several parts as brieily as lthe nature ofthenvention will admit of, there arc other minor improvements that'willbe seen, and their utility suggested, ou aclose inspeetion'of thevarious arrangements and combinations', some of which, separatelyconsderedawe,4 perhaps, common to other machines, und such desire `todisclaim otherwise than when combined and'operating substantially asshown und set forth.v

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of the'movable frame I H', carrying the feed-rollersI'I andfH H, with the slotted post h L,"rack`V, pinion W, weightedpulley Q,. handsciew U, and latch a: x, when constructed, arranged, andoperated in the manner and for the purposes described.

2. The hinged slotted bar E, upon which are sawlguard D, pins pp, andwedge-roller P, allA constructed and operating substantially asdescribed. l

3. The deflecting-devi'ce, when constructed with tl1e rollers un and0-0, and operating substantially as set forth. i v

D. B. BARTHOLOMEW.

Witnesses:

- WM. B. WILEY,

PHILIi S. BAKER.

